Slide-valve



(No Model.)

2 Sheets-Sheet '1.

W. GOODSPEED.

.SLIDE VALVE;

Patented Aug. 3,1897.

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NORRIS PETERS no. MTKMJYHQ. wAsHmmuN. n, c.

2 SheetsSheet 2.

W.- GOODS FEED.

' SLIDE .VALVE.

PatentedAug. 3,1897,

UNITED STATES PATENT OFFICE.

W'ILLIAM GOODSPEED, OF BLOOMFIELI), IONVA.

SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent No. 587,367, dated August3, 1897.

Application filed March 30, 1897. Serial No. 630,018. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM Goonsrnnn, a citizen of the UnitedStates,residing at Bloomfield, in the county of Davis and State of Iowa,have invented a new and useful Slide-Valve and Auxiliary Out-OffforSteam-Engines, of which the following is a specification.

This invention is in the nature of an attachment that may be applied tothe slide-valve of any ordinary engine with only slight modifications tothe valve, and it is especially designed for use in connection with alink-motion for controlling the speed and direction of rotation of theengine.

My object in this invention is to provide a valve of this class ofsimple, strong, durable, and inexpensive construction that may beadjusted or set to automatically cut off at any desirable point withoutemploying any valvestem or the like in addition to the ones ordinarilyused.

A further object is to provide a Valve in which a comparatively largeand free induction-port is provided when the valve is set to cut off ata relatively small portion of the pistons stroke to thereby tend toproduce a high initial pressure and the consequent increase of steam andthe increased efficiency of the engine.

A further object is to provide a valve which may be operated so as toadmit steam to the cylinder during the entire stroke of the piston, sothat the entire boiler-pressure may be used throughout the entire strokeof the piston when it is desired to generate an unusual great amount ofpower, and, further, to provide an engine of this class in which thewear upon the valve-seat will be extended over a large area, and hencethe durability of the valve will be increased.

My invention consists, essentially, in the construction of the valve andin the construction, arrangement, and combination relative thereto ofthe auxiliary cut-ofi, as hereinafter set forth, pointed out in myclaim, and illustrated in the accompanying drawings, in which- Figure 1shows a top or plan view of the valve mounted on its seat within thesteamchest. Fig. 2 is a central longitudinal vertical section on line 22 of Fig. 1. Fig. 3 shows a transverse sectional view through the line 33 of Fig. 1, and Fig. 4 shows a detail perspective view of parts of theengine and valve to illustrate certain details of construction.

Referring to the accompanying drawings, I have used thereference-numeral to indicate the steam-chest, having the valve-seat 11therein provided Wit-h the induction-ports 12, leading from thevalve-seat to the opposite ends of the cylinder, and also theexhaustport 13, leading from the valve-seat at a point between the otherports to a point of discharge.

The reference-numeral 14 indicates a slidevalve which differs from thevalve of ordinary construction in that it has a diminished inside oroutside lap, and 15 indicates a stem passed through the packing-box 16and having a yoke 17 on its end fixed to the valve 14.

All of the above elements are of the ordinary construction with thesingle exception noted.

The essential novelty in the valve consists of a rectangular auxiliarycut-off 18, having a flat lower surface and having a rectangular openingin its central portion. The dimensions of this central opening are inone direction the exterior length of the valve plus the width of one ofthe ports 12 and in the opposite direction exactly the width of a valve.In the side pieces of the auxiliary cut-off are the longitudinal slots19, and the referencenumeral 20 is used to indicate standards screwedinto the face of the valve-seat to proj ect upwardly through the saidslots 19.

21 indicates elongated washers having openings, through which thestandards 20 are passed, so that the under surfaces of the washers mayengage the top surface of the auxiliary cut-off. 22 indicateexpansionsprings mounted upon the standards 20, and nuts 23 are placedon the upper ends of the standards to compress the springs to therebyhold the washers 21 in frictional contact with the auxiliary cut-off 18.This arrangement is only for use when there is no steam-pressure in thechest.

In practical operation it is obvious that the valve proper will be moveda slight distance upon its seat before engaging the auxiliary cut-off,and when it does engage the cut-off will be moved slightly that is, whenthe stroke of the valve is of greater length than the width of the portsleading to the cylinder.

This valve is designed for use only in connection with a link-motion orother means for regulating the length of its stroke. Assum ing that thelink-motion is set so that the valve will cut off at one quarter-strokeand assuming the valve to be in its position for starting-that is, witha small lead-opening-it is obvious that the first movement of the valvewill be to open the induction-port wide. Then the auxiliary cut-oft ismoved by the valve, so

that the side of the cut-off adjacent to the induction-port will bemoved to partially cover a the said induction-port. Then as the valvestarts on its return movement it will meet the auxiliary cut-off or thatportion thereof that is partially covering the induction-port at a pointmidway between the sides of the induction-port, and hence the steam willbe cut off, While the valve has only partially covered theinduction-port-that is, before the full stroke of the valve has beenmade. It is obvious that the further movement of the valve-tl1at is, toits outer limit and part of the way back will not open theinduction-port. Hence we have a one-quarter cut-oft with a full openingof the induction-port and also a full opening of the exhaust-port. It isto be understood in this connection that the earlier the cut-off thegreater is the length of valve movement required.

Assuming that it is desired to work the engine to its fullestcapacity,we will assume that the valve is in the same position as in theformer instance-that is, with a small lead open-and we will assume,further, that the linkmotion is set or adjusted so that the strokeimparted to the valve will be only the same as the width of theinduction-port. It is obvious that in this instance the inductionportwill be opened gradually until at the end of the valves stroke it willbe wide open. In this instance it will be noted that the auxiliarycut-oft is not moved, and hence the friction of the valve upon its seatwill be lessened, inasmuch as the area of the valve upon which the steammay press is less than with the ordinary-sized valve having considerableoutside lap.

Having thus described my invention, what I claim as new therein, anddesire to secure by Letters Patent of the United States therefor, 1s-

The combination with an engine having a steam-chest and induction andexhaust ports, of a slide-valve 14 having no inside or outside lap, astem 15, a yoke 17 thereon fixed to the valve, an auxiliary cut-cit 18,having slots 19 at its sides, standards 20 fixed to the valveseat toproject upwardly through the slots, washers on the said standards toengage the sides of the auxiliary cut-off, expansionsprings on thestandards, and nuts on the top -of the standards to engage the springs,all

arranged and combined substantially in the manner set forth and for thepurposes stated.

WILLIAM GOODSPEED.

\Vitnesses:

DILLON 1'I. PAYNE, GEO. '1. SowERs.

